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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad73c9847179ff827212c7a2a4663c596588d16971d7bbc6dd6df88a79c3476' 
  AND token = 'wCWtreoaYneOtNZjx9zmpL3Ljgz742lKEN7X/Rr8w3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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