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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951b2f3d15a4e5d58c82da15b41121807ff0d16557d1c6102bb976625e2d9c87' 
  AND token = 'WR8Fqx7Cba/jZ2wbHdUcrP1N769VuVSjWdDOeoMH3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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