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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0f6b538b83730be97a45d491b075849cd7968d01780f3b6aae2c9b695982d8' 
  AND token = 'T6mSB/u43i7xOziGnGOK8bJOStcitIdg6tJhgvRXJHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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