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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14b217868c34a7adcd75756041d1fdcb205bdcef59d1db259ec559d56a09092' 
  AND token = '34aiuSdvvnWdBb+6SUta0Sh4Oin3XJUfhAOhXflHlCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}