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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768702197aa3e62dbdc08668a8e43d7fdcba32b8ad8ac1d6cdf68f63dbf089d1' 
  AND token = 'GcrcKnWz6Ec0A6iMNVLEBhY1zxButyd9/RktZr1rybs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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