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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d0a83e2ea9de8eb55e1e50509e77233ad16f1b34ad20c378ea0f04b0e92eac' 
  AND token = 'mSEFgDwprjzUdry5RaQioXipZp38sfN1ywSe6rDndyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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