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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e478390dfdf5c04f16d42893b85fa151e750c1c27809d7c4bca2e44c4d2ad1' 
  AND token = 'TKBx9e4dhOprwbSeiMB10fvdUcZEqRccK7ol0UCJJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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