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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2af5a54c5b06b7c4296b4c8357ffecbf7406c860fbab39c90e47cab2354b4c' 
  AND token = 'bZT4CBCnAjALYmpMcvfZQVkSMTMf2VCdkt/CdD1QdNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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