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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4544070b74d16a44d78dff24977731b935274a5688ebed9166bae7553f756082' 
  AND token = '++bQMIn7qDQknNLDCTMyUBM1nbjVqDDzQhe+bCxNT30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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