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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8fed72b95a3e6cf4ba2321abf0544c8b76b6dcdc4cca93870c4667defdb679' 
  AND token = 'BxWxcaIpe1G13GrAFTsitQzyK1poNU/vzkNi1UqNwAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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