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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473f50c73dc20e3605be23afd01c779526ae92d94e351a66fa3e9d6b39fffaf' 
  AND token = 'OMvVri8s7zrqfmQr5WmQGMgbh821+oiFTVWOPeqtrBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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