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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6707419c879e49f0de7b0eac776bf33618028cea66ff470fc85a7322f4f6f0' 
  AND token = 'JI12PkOxs9zRbVu8F/FoYvuA/RWx+tncrFPyz+6o4i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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