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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f249ca3a029a45643430a9814cc69a3c012eda5ef10ac7bc650487769936e58' 
  AND token = 'rMrXRTjH5kU7AYjTQ5F/1GmX2IIIj4e6oyUnRUczEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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