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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6d9612723ee3cbb26c7c4ea929716c7c1b09bc8f088856544fe59de9511d63' 
  AND token = 'IZwnqqWcMF0wLvH5qj2gK98SNKbf994qrtDsJp/HJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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