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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d03fa932ad2574e1ee33fb42c072d50af691345a2ba1a33b21aa9658064502' 
  AND token = 'g0yj2Vcs1qk82tXx/dIn/QCz0JaFgTplC9jauOeDvIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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