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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7471c83bb9b5fc50146cc8c5fb44d164a9a5f623a38e71817369afa87553a50c' 
  AND token = 'O5iJWuTRtuJr6O55ieHG6XxUQG2PwwW+Tk79ogHGCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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