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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bb989a07a0085c904dc458e11a3acdf7cd3cb1ec939c0999fa0ebf0869e54b' 
  AND token = 'Q2efzeq3A6n4RrN9GoKgleBDG2q0pFUMjYTsIdtiINY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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