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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d002c88a820407ebbd0d06ad625c8f74856d90df0c129526e2617f56112f67' 
  AND token = 'HnNaoCpvna6jZD2ZLn1eJ3KEWgmMu6Cn+gjAgMfd7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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