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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23478be12ef941a05a0d0d6dd1a560301e23f14a2cb0aa4eb9c5117179978233' 
  AND token = 'NmFDDBcnFh6+SIg444cQ/qjHc7yUgEVnWZIWNdLwGbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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