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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652b40fff131740b9a7c6ae0e7e47a680e1e935a3062c222f15b4f0d4e41edf2' 
  AND token = '6rI/u3dV/FIzRTazbndtV1HMLH/TCQ9fid/Ul/YUq14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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