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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034207ccf1d72b6c53fae63865f2d69338786d2357f3f52046693dafa242d9b7' 
  AND token = 'bmP2dxDcbQ16yu3aig8bguoTYVD6uJRGRUMRKQakKOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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