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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ce38eff8b3b0e2bfda13b279b08bc0c8ccc026dc4ce39be7c19f0536b7cfd2' 
  AND token = 'ZtmaOPvRcCFRB39GPmMBzxMOXZYeuIX6Wi6OTwOPEO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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