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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f80d158b6d002c2ba19f8a0949cd25fba458336aae057a87020c8733926ec5c' 
  AND token = 'ddCBMVa3Dw5tS28hXy8/pueZbWUU8iFrUkmJSDWaqrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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