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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b27968246bd0555df2c94f50ee1c4e132165bd1cf73c6033f6039f09594653' 
  AND token = '8NVc4LVE530E/mfMdvA2r8Pz36cba0iGO3xO4b0p1Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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