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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d2d84f2082c0a802d6d0bc055fcda55bdaece42a89b84759e346976dbc3a04' 
  AND token = 'bTcKYaOqclHU214d+x8EVS+YnsNNtQUEf3NuCTXQ8w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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