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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325362a9c6ddff30922c2b40754895a9a26931a5a002c840af39ea1c6f324fe2' 
  AND token = 'NtdPlvbv0lkAiUsAdPLX7rtpwd/SxJ7TGXbvI9MlBRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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