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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04500a95d1d8adfcea445541c41dbd2e1d01c9c8cad4864cbf37d5f7ec3ccc6' 
  AND token = '7wIScI6i6R79V1T9lAH8mG5XvG5aFfIDefpD7DPPqG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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