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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be98832accdd5526975f8e8c3acd2906c3065c56898b8343361674f332b530ca' 
  AND token = 'mV0Cdjlf6JrsItBwSQO+by6k2Mb/KF03P5F4G/RdymU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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