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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fe55a2bea95f4150d60c082c4a1da51c7797ac41e1a3edb00f9582698c8958' 
  AND token = 'LfYLBLkCTfPCvq95LaJUVNQSB1vDl2i5PeCDjyff5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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