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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907747b783a3fbcb627c030632a86188d3ac64022698ad812f2d444f3a5b1461' 
  AND token = '0FnHkrfleBED6T9yqU0nGW2FZatrNLy3IEGlMSMTyOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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