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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f21ffb443a58dba9ce2357bbf83cfd5ef60832399515c1dfbb05859c3f0c535' 
  AND token = 'i70bUnmeY3qfhkPWWKDQxadWTQrIr1pa96p8zaj59B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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