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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d78a7279dd92c4ccdad1a164e448236ae96e285c514f57ecfc9019db7af5660' 
  AND token = 'FNH5Jad7PHL+VVEs8yZtHcIWqNKBwvv1UBwex+SqexM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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