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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7df19fd4e45fb4685e15db5b202d319c5491ed5433e9d4b14d8f017a07fdbe8' 
  AND token = 'm5NKNVszgol4KYdRxa5tGbSfQQQVKsacVIf1/WISr5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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