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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745118ab10c94d1b1fdc6aca1bdaab88635839404bb43db20844c24e6c8efd07' 
  AND token = 'bguYG+ZFSR80K6te6HkB2h7Kk8KNyFF/K/Jwr0J/HBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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