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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82e3ee751c80feb63774068c8fe5635c8728134ce0bcca29509863478b3ca3e' 
  AND token = 'TDdp8+cl7z651k9rZcAJkvk7qcc9Q3Bfhkiw1r8cCac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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