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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd080a524fdfd79fdf7fd2a6e1966002274ed78ffe61f719c074c0f8dc9730d' 
  AND token = 'ayFObH3vpURKIkk6SqAcNcC5dr1eVaCGRY3Fw0Lrtfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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