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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c35a0371c97fe6233e047889722e05e743fe657ad54a083513079b7e610eaa0' 
  AND token = 'VfohLeLwAy3u8U2ruVtNfeiVnwf8RrJ9se1q65GHUgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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